• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 63 subscribers
  • Views 688 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ76952: Can I check SOC and SOH through Coulomb Counting?

Downey Kim
Expert 2675 points
Part Number: BQ76952
Other Parts Discussed in Thread: BQ76940

Hi TI experts,

I have a few questions about the BQ76952.

1. Can we check SOC and SOH through Coulomb Counting?

2. What is the biggest difference between BQ76952 and BQ76940?

3. There are two types of charge and discharge. What are the advantages and disadvantages of the high-side FET and low-side FET methods?

Thanks,

Downey Kim

  • 0
    TI__Guru 54715 points

    Hi Downey,

    1. SOC can be determined by coulomb counting.  SOH is often a decision on the change in capacity over time.

    2. BQ76940 supports 15 cells with simple features.  BQ76952 supports 16 cells with higher accuracy and more configurability.

    3. High side allows easy ground-referenced communication with the battery like I2C or SMBus or simple UART like communication.  But high side has FET control voltages outside the range of the battery, so you need a charge pump or boost converter to get those higher voltages, and the available current from them is rather limited.  Low side has the primary FET control voltages within the range of the battery voltage, so driving the gates is relatively easy, but if you want to communicate with the battery the low side reference is switched so you need an isolated interface or one with a large voltage compliance range, or referenced to PACK+ which is unusual.